Neocallimastigomycota

phylum of fungi

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July 17, 2026

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The Neocallimastigomycota are a phylum of anaerobic fungi that play a crucial role in the digestive systems of herbivorous mammals. These fungi are particularly important in the rumen of animals like cows and sheep, where they help break down plant cell wall components such as cellulose and xylans, which the animals cannot digest on their own. This process is essential for the efficient extraction of nutrients from plant matter by these herbivores. While fungi, in general, have ancient origins dating back about a billion years, the Neocallimastigomycota are a specialized group adapted to the unique environment of the digestive tract.12

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fungus
Annotated classification
Phylum Neocallimastigomycota Found in digestive tracts of herbivores; anaerobic; zoospores with one or more posterior flagella; lacks mitochondria but contains hydrogenosomes (hydrogen-producing, membrane-bound organelles that generate energy in the form of adenosine triphosphate, or ATP); contains 1 class. Class Neocallimastigomycetes
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Phylum Neocallimastigomycota Found in digestive tracts of herbivores; anaerobic; zoospores with one or more posterior flagella; lacks mitochondria but contains hydrogenosomes (hydrogen-producing, membrane-bound organelles that generate energy in the form of adenosine triphosphate, or ATP); contains 1 class. Class Neocallimastigomycetes
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